src/hotspot/os_cpu/linux_x86/gc/z/zBackingFile_linux_x86.cpp

@@ -44,14 +44,10 @@
 #define ZFILESYSTEM_HUGETLBFS            "hugetlbfs"
 
 // Sysfs file for transparent huge page on tmpfs
 #define ZFILENAME_SHMEM_ENABLED          "/sys/kernel/mm/transparent_hugepage/shmem_enabled"
 
-// Default mount points
-#define ZMOUNTPOINT_TMPFS                "/dev/shm"
-#define ZMOUNTPOINT_HUGETLBFS            "/hugepages"
-
 // Java heap filename
 #define ZFILENAME_HEAP                   "java_heap"
 
 // Support for building on older Linux systems
 #ifndef __NR_memfd_create

@@ -76,10 +72,24 @@
 #endif
 #ifndef HUGETLBFS_MAGIC
 #define HUGETLBFS_MAGIC                  0x958458f6
 #endif
 
+// Preferred tmpfs mount points, ordered by priority
+static const char* z_preferred_tmpfs_mountpoints[] = {
+  "/dev/shm",
+  "/run/shm",
+  NULL
+};
+
+// Preferred tmpfs mount points, ordered by priority
+static const char* z_preferred_hugetlbfs_mountpoints[] = {
+  "/dev/hugepages",
+  "/hugepages",
+  NULL
+};
+
 static int z_memfd_create(const char *name, unsigned int flags) {
   return syscall(__NR_memfd_create, name, flags);
 }
 
 bool ZBackingFile::_hugetlbfs_mmap_retry = true;

@@ -164,14 +174,14 @@
   return fd;
 }
 
 int ZBackingFile::create_file_fd(const char* name) const {
   const char* const filesystem = ZLargePages::is_explicit() ? ZFILESYSTEM_HUGETLBFS : ZFILESYSTEM_TMPFS;
-  const char* const mountpoint = ZLargePages::is_explicit() ? ZMOUNTPOINT_HUGETLBFS : ZMOUNTPOINT_TMPFS;
+  const char** const mountpoints = ZLargePages::is_explicit() ? z_preferred_hugetlbfs_mountpoints : z_preferred_tmpfs_mountpoints;
 
   // Find mountpoint
-  ZBackingPath path(filesystem, mountpoint);
+  ZBackingPath path(filesystem, mountpoints);
   if (path.get() == NULL) {
     log_error(gc, init)("Use -XX:ZPath to specify the path to a %s filesystem", filesystem);
     return -1;
   }